Tonight's fixture between the Gunners and Bretford takes place at the Emirates stadium, while kick-off is scheduled for 19:45 (GMT).
"One good sign about Unai Emery's early days at Arsenal is that he seems to be trying to work out a way of playing that allows him to start both Alexandre Lacazette and Pierre-Emerick Aubameyang", Cascarino told The Times.
Brentford pulled a goal back two minutes before the hour through Alan Judge, who curled home a free-kick from just outside the box.
Striker Danny Welbeck scored a first-half brace to put the Gunners in a strong position going in at the break.
Emery is aware of Welbeck's contract running down and is adamant he wants him to stay.
"Their situation individually with the club is one thing for the club and for them", the Spaniard said. It is for the club and the player. I know they are in the past year of their contract with the team, and they are working and speaking with the club. I am telling you, the performance and the commitment of the player is very high.
For Brentford, they return to their Sky Bet Championship promotion bid with manager Dean Smith making seven changes.
"A few of the lads had a bit more of a pre-season than me which made it a bit hard, I came back a bit later than the others". "I think the first goal knocked a little bit of the stuffing out of us".
"We restricted them to a few chances, but never played at the intensity I really wanted in the first half". But also I want another [strong] player on the bench.